NO. 1162. BRACEYURA COLLECTED BY THE ALBATROSS— RATHBUN. 595 



89. PORTUNUS (ACHELOUS) ORDWAYI (Stimpson). 



Adielom ordnayi Stimpson, Ann. Lye. Nat. Hist. N. Y., 1860, VII, p. 224. 

 2s'(ptiinn8 ordwayi A. Milne-Euwakus, Crust. Reg. Mex., 1879, p. 217, pi. xl, 

 lig 2. 



Abroltios Islands. 



90. PORTUNUS (ACHELOUS) AFFINIS (Faxon). 



Achelous affinis Faxon, Bull. Mus Coiup. Zool., 1893, XXIV, p. 155; Mem. Mu8. 

 Comp. Zool., 1895, XVIII, p. 23, pi. iv, fig. 1. 

 I'anaiua Bay, at station 2795, 33 fathoms; station 2803, 20 fathoms; 

 and surface station 24 (young). 



91. PORTUNUS (ACHELOUS) MINIMUS, new species. 

 (Plate XLIV, fig. 3.) 



Front eight-toothed^' second, fourth^ and sixth lateral teeth reduced; 

 lateral spine twice as long as eighth tooth; merus with four spines on 

 anterior margin; spinulcs at posterior distal margin of sivimming feet. 



This is a very small species, as adults average about 15 mm. in width. 

 Surface pubescent; ridges fairly well marked; the inner portion of the 

 transverse branchial ridge is advanced to a point in line with the sixth 

 hiteral teeth. Front very wide; four median teeth, obtusely rounded, 

 separated by rounded sinuses; the median pair of teeth narrower than 

 the lateral and more advanced; the lateral sinuses as deep as the 

 median and much wider. Supraantennal teeth less advanced, two in 

 number, subacute, separated by a shallow sinus. Of the superior 

 orbital fissures, the inner is a narrow slit, the outer is V shaped. The 

 outer orbital tooth is less advanced than any of the frontal teeth, is 

 rather large, and obtusely rounded. The other lateral teeth are acute. 

 The second, fourtli, and sixth are smaller than the others^, and them- 

 selves diminish in size in the order named. The lateral spine is curved 

 upward and forward and equals in length the width of the two preced- 

 ing teeth. The inner suborbital tooth is produced to the line of the 

 second pair of frontal teeth. Outer sinus of the suborbital margin 

 V-shaped. 



Merus of the chelipeds with three anterior spines, of which the prox- 

 imal is the smaller, the others subequal; posterior margin terminating 

 in a small spine. Carpus with a small outer spine and a large inner 

 one about three times the length of the outer, Maiius with two spines, 

 one next the carpus and one near the distal end of the upper margin. 

 Postero-distal margin of merus of swimming feet armed with fine 

 spinules, but without a single long spine. 



Dimensions. — Male, station 2827: Total length, 10.2 mm.; width, 17 

 mm.; width between last an tero- lateral sinuses, 14.1 mm.; exorbital 

 width, 10 mm. Female, station 2820: Total length, 9.4 mm.; width, 

 15.7 mm.; width between last sinuses, 12.8 mm. 



